Compensating device for carburetors



UNiTED STATES Pavifarr ori-furia.v

PERRY J', EUBANKS LAND'GHARLES W.' BUSH, 0F CLEVELAND, OHIO.

conrnivsarme nevica ron. cannunmona Application lled July 14, 1920, Serial No. 896,181. I Renewed January 2, 1995.

i To 'whom it may concern.'

Be i` known that we, PERRY J. Ennemis andv CHARLES W. RUSH, citizens of the United States, residents of Cleveland, countyof Cuyahoga, and State of Ohio, have invented new and useful Im rovement's in Comgensatin Devices for arburetors, of whic the fo owing is a specication, the principle of theinvention being hereinexplained, and the best mode in which we have contemplated applying that principle, so as i function properly, irresp to distinguish it from otherinventions.

Our invention relates to carburetors, and' articularly to compensating devices wherey roper proportions of fuel and air may be ged to a motor to enable the same to ective of temperature conditions, `without imiting the amount .of air necessary to operate at maximum efiiciency.

The annexed drawing and the following descri tion set forth in detail certain means embo ying our invention, the disclosed means, however, constituting but one of the various mechanical forms-in which the principle of the invention vmay be applied.

`In said annexed drawing Figure lrepresents a vertical longitudinal section of the air inlet pipe and a carburetor vinvolving the .elements of our improved comensating device', showing,'in full'lines, an intermediate position, of an air -inlet valve and some connected parts, resulting from the prssure'diifereiice between a chambered member on the inside of the-valve controlling the air inlet and 'the normal outside atmospheric pressure, incident to a given motor speed; and, indotted lines, extreme positions of said valve and parts under othermotor speeds. This view shows an elevation I A of fragmentary parts of a carburetor roper.

Figure 2 is a broken lan view o a carbui'etor4 yportion including our improved com ensating device; l

Figures 3 and 4 are sections similar to Fig-V ure 1, but showing respectively the starting and full open positions of the compensating device; and

Figure 5 is a broken section -and elevation ofthe `valve and some connected parts.-

Referring tothe annexed drawing, wherein the saine ordinals refer to like parts in the of-a-.carbureter 2 having a ilangedsl;c

diierent figures, 1 represents an air conduit ipe 3 leading tothe manifold, not shown. ured by inneans of screws 4 and flange 4 toone endofa chambered member 5, is a pipe 4, which chambered member 5, inturn, is ses cured at its other end by means of screws 6v and flange 62 to a pipe 6 communicating with the atmos here or communicating with an air heating evice, not shown. The ipes 4 and 6 are formed respectively with spiders 7 and 9 having. central hubs 8 and 10 respectively forniin bearing bushings for a pair of reciprocab e plungers 11 and 12, respectively. The plungers 11 and 12 are secured together in any suitable manner, or may, if desired, be a single member, and a valve is mounted thereon to control tlie inner open'end of the pipe 6. In the means shown in the accompanying drawing, which are but an exemplificationof the methodv of securing .the plungers 11 and 12 together and of the mounting of the valve, the plunger 12, at one end, is formed with a threaded extension 13 vadapted to be ta ped into an enlarged end portion 18 o the plunger 11. Th'e valveis illustrated by the ordinal 15, and is formed with a central recess 16 `through which the threaded member 13 passes, the valve thus being tightly mounted upon the plunger 11--12, as lainly shown in Figure 5. I The valve 15 is adapted to seat over the iiiner opening 17 of the pipe 6. This valve 15 is normally held to its seat,

as hereinafter fully described, by means of 4a coil spring 25 in combination with a pin through which passes a in 21 secured in the sleeve 20l and extende laterally of said sleeve on both sides. The in 21 is longitudinally movable vin-theeongated slot 19 relatively to the plunger 11-12. A hub 23` of a yoke-shapedmember 22 is secured to a shaft 24, the respective arms 22 of the yoke enclosing `the sleeve 20, and each being formed with two fingers 22 spaced'so as to provide r'ec 2,2' intowhich the two ends of the pin 21' extend. The shaft 24 is 'actuated froin the dash or any suitable operating v position Aupon the machine by any desired means 14.

The device which we have just described, and which-fis shown Vin the accompanyinfg drawinggisintendedtoserveasaverye fective air furnishing means for the carburetor 2 both during the early Stages 4of operation, when the motor is being heated up, and during the .later stages, when the normal operation takes place. It is well known that, due to the increased weight of cold air and the increased viscosity of the fuel, the motor, while bein heated, can not obtain the proper amount o fuel which, in proportion to the air, should be maintained at all times for normal running. Therefore, when starting with a cold motor, our device is positioned as shown in Figure 3, in which posiy tion the pin 21 engages the forward end of the slot 19 in the plunger 12 whereby the valve 15- is locked solidly against the seat 17 'and thus the suction or pressure head is directed entirely against the source of fuel supply, thereby furnishing a charge of pure fuel to the motor. Immediately after thefrst explosion of the motor, the device is moved to a position where it is possible for `some air to be furnished by the valve 15, such position being termed by us an intermediate position, and an exemplilication of this position is shown in Figure 1. In this position the pin 21 is in an intermediate portion of the slot 19 whereby the plunger 12 isl movable with respect to the sleeve 20 against the action of the spring 25 and the valve 15 has a range of movement, de ndent upon the suction, between the dottedmline positions of the valve shown in Figure 1. A osition of the valve for a given motor speed is indicated by the full line position in said figure. At other motor speeds, the valve 15 would be disposed at some position intermediate the two-extremes shown by dotted lines. This adjustment of the device from the locked position shown in .Fig-

- ure 3 to the intermediate position shown in Figure 1, is effected by the operation of the shaft24, which, through the yoke arms 22' and pin 21, moves the sleeve 20 relatively to the plunger 18, relaxing the tension of the spring 25. It is evident that, dependent upon the intermediate position to which the device is moved, the same amount of suction or the same motor speed will eifecta differential in the amount of' opening movement produced by the valve 15. Also, dependent likewise upon the intermediate position to which the device is set, different motor speeds will effect a differential in the com arative amounts of opening movements p uced in the valve 15. When the motor has Ybeen properly warmed up, the device isv moved to the position shown in Figure 4, in which position the pin 21 is in engagement with the rear4 end of the slot 19 inthe plunger 12 whereby all tension ofthe spring 25 against the valve 15 is eliminated and the valve 15,-

plunger 12, sleeve 2O and' interposed spring 25 have been moved bodily as a unit to space the valve v15 sufficiently from its seatY 17 to passage 6 into the chamber 5, so that then' the carburetor is permitted to acquire a supplyof air forall operative requirements, withoutthe functioning of our improved compensating device.

During the warming-up process, illustrated by the position shown in Figure 1, whenever the motor slows down the valve 15 will tend to go to the seat 17, which will create a higher suction upon the fuel and thus add the desired additional fuel. Without this compensation, at slow motor speeds, the gasolene openings are eomparative y too small, during the Warming-up period of the motor, unlesssome added suction is superinduced or the amount of fuel increased in some manner. Thus the motor is not sufficiently fed with fuel. Our device allows for the necessary added suction upon the fuel at'these slow motor speeds, and thus in this manner furnishes the desired additional comparative amount of fuel, without limiting the amount of air that is n for successful operation at any motor s Our compensating device allows for the production of a differential in the opening movement of a carburetor airinlet valve produced by the same amount of suction and as a range of movement from a position in which the valvepositively is held in a closed position to a position where the device is absolutely inoperative, in so far as any effect upon the opening movement of the valve is concerned.

What we claim is:

1. In compensating devices for carbu- 4ret'ors, the combinationiwith a carburetor formed with an' air inlet.; of a valve for said inlet; and meansv operable to .positivl hold said valve in closed position; yiel ingly hold said valve opemng movement and positively hold said valve in" full open position.

2. In compensating devices for carburetors, the combination with a carburetor formed with an air inlet; of a valve for said inlet; a plunger to which said valve is secured; .a sleeve slidably mounted upon said plunger; a spring interposed between said sleeve and valve; an actuating lever connected to said sleeve; and means-interposed be- I tween said sleeve and lunger for limiting the movement of said sleeve with respect to the plunger in both directions whereby said valve may be positively held by said lever 1n closed and full open positions.

3. In compensating devices for carburetors, the combination with a carburetor formed with an air inlet of a valve for said inlet; an actuating lever for said valve; and means interposed between said lever and valve adapted to provide a yielding conneclll tion vbetween said lever and valve when said vlever is in intermediate positions and a direct `connection between said lever and valve when said lever approaches its limit of movement in either direction.

4. In compensating devices for carburetors, the combination with a carburetor formed with an. air inlet; of a valve for said inlet.; a shiftable controllingmember for said valve; and a springinterposed be- 10 tween said valve and controlling member for yieldingly resisting opening movement of said valve,1said controllin member be' directly engageable with sai valve to shi said valve to inoperative position.

Signed by us this 30th day of June, 1920. PERRY J. EUBANKS.

CHARLES W. RUSH. 

